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The periaortic lymph node group is divided into three subgroups: preaortic, paraaortic, and retroaortic: The preaortic group drains the gastrointestinal viscera. They can be subdivided into three groups: the celiac nodes, the superior mesenteric nodes, and the inferior mesenteric nodes.
Virchow's nodes are named after Rudolf Virchow (1821–1902), the German pathologist who first described the nodes and their association with gastric cancer in 1848. [4] The French pathologist Charles Emile Troisier noted in 1889 that other abdominal cancers, too, could spread to the nodes.
Psoas abscess is a collection of pus in the iliopsoas muscle compartment. [1] [2] It can be classified into primary psoas abscess (caused by hematogenous or lymphatic spread of a pathogen) and secondary psoas abscess (resulting from contiguous spread from an adjacent infectious focus).
Spinal tumors are neoplasms located in either the vertebral column or the spinal cord. [1] There are three main types of spinal tumors classified based on their location: extradural and intradural (intradural-intramedullary and intradural-extramedullary).
A nerve sheath tumor is a type of tumor of the nervous system (nervous system neoplasm) which is made up primarily of the myelin surrounding nerves.Nerve sheath tumors can be benign or malignant, and may affect both the peripheral and central nervous systems.
The paraspinal muscles are then pushed off the laminae to the medial edge. A lateral radiograph is done with a radiopaque marker, which is placed on the dorsal osseous region. This allows the regions of interest to be determined.
Histologically, ganglioglioma is composed of both neoplastic glial and ganglion cells which are disorganized, variably cellular, and non-infiltrative. Occasionally, it may be challenging to differentiate ganglion cell tumors from an infiltrating glioma with entrapped neurons.
It typically describes the removal of a tumor or mass and ancillary lymph nodes that may drain the mass, as in radical mastectomy. [2] It is opposed to for example palliative surgery which is intended for symptom relief rather than complete removal of cancer tissue.